City of Mankato maintenance yard. Anti-icing applied hours before this photo was takenDry
Same LCS Treatment. Pavement temperature have risen to 15 degrees F. Light snow is falling
LCS Treatment at 15 degrees F pavement temps
Note the difference between the anti-icing photo and the typical city street photo. Same day, same storm, same time.
These saddle tanks hold 100 gallons each they’ll come1/side but 2/side can be done. The Tailgate tank can be adapted to fit on this truck to carry a total of 600 gallons total on the truck. You would be adding 6000 pounds to the total weight.
On 33’s the tailgate tank holds 100 gallons On 35’s the tailgate tank holds 200 gallons
Will talk more benefits of anti-icing vs de-icing but basically the concept of anti-icing is to apply a thin layer of material prior to storm event to create a barrier between the pavement and the ice. To allow for mechanical snow and ice removal Anti-icing material can be applied at a faction of the de-icing rate
Clean Rivers, Clean Lake 8 -- Smart Snow and Ice Removal -- Connie Fortin
The Latest in Smart Snow and Ice Control Connie Fortin – Fortin Consulting Inc www.fortinconsulting.com
This talk is based on excerpts from the Minnesota voluntary certification programwww.pca.state.mn.us/programs/roadsalt.html
The Situation SALT USE forWINTER SAFE TRAVEL Permanently Polluted Water
How does salt affect our waters and what canwe do about it?
Salt becomes invisible but it doesn’t disappear. It mixes with water and stays in solution.
The U.S. Government has standards for pollutants• Chronic standard for Chlorides: 230 mg/l = 1 teaspoon salt in 5 gallons water
National: Exceedances of EPA Water Quality Criteria for Cl# of Sites 12 6 21 6 29 15 7 7 11 12 17 14 5 19 22 6 3 162 506739/5266 1383/995
Comparison of lake chloride concentrations in 39 Minnesota lakes and rock salt purchases by the state of Minnesota (Novotny et al. 2007).
1 ton of rock salt ($50) causes greater than $1,450 in corrosion damage to bridges, vehicles, and environment (TRB Report)Ali Akbar Sohanghpurwala- Road Salt Symposium 2008 (photo and fact)
Working with the maintenance industry is the key to safe surfaces and clean water
Store on impermeable pad and coveredStorage areas are #1 risk for groundwater contamination. If your pilecontaminates the ground water youwill be held responsible
Be safe:Secondary containment or double wall tanks Storage: Liquids
Plan for year round storageDo not use salt just to get rid ofit at the end of the winter.
Speed of Melting Pavement One Pound of Melt TimesTemperature º F Salt (NaCl) Melts 30 46.3 lbs of ice 5 min. 25 14.4 lbs of ice 10 min. 20 8.6 lbs of ice 20 min. 15 6.3 lbs of ice 1 hour 10 4.9 lbs of ice Dry salt is 5 4.1 lbs of ice ineffective and will blow away 0 3.7 lbs of ice before it melts -6 3.2 lbs of ice anything
Know the Lowest practical melting temperature for each material Chemical Lowest Practical Eutectic Temp. Optimal Melting Temp. ConcentrationSodium Chloride 15º F -6º F 23% Magnesium Chloride -10º F -28º F 27 to 30%CaCl2 (Calcium -20º F -60º F 30% Chloride)CMA (Calcium Magnesium 20º F -18º F 32% Acetate)KAc (Potassium Acetate) -15º F -76º F 50% Blends Talk to supplier Talk to supplier Talk to supplier Winter Never melts -- Never melts --Sand/Abrasives traction only traction only
Use application rate tables!www.pca.state.mn.us/programs/roadsalt.htmlOur rates are low, they are a good target, not a starting point
Yearly Calibration Pg 10 Calibration should be the backbone of your snow and ice program!
Calibration separates the topperforming organization from the average organizations
If you are applying materials with only your eyes to judge.Look for better ways!
Almost twice the rate doesn’t “look” that different 500 300
Mixing liquids with dry saltWet salt increases the speed of melting! Salt can start working NOW, no delay.
Salt Retrieved from 78% 24ft. pavement Unretreived salt P r 46% e - D 30% w r y 9% 12% 12% 9% e t 4% Michigan Highway Department Outside 1/3 Center 1/3 Outside 1/3
With wet salt you can use 30% less…. just turn down your application rate.
Two good options for adding liquids: On the truck or on the Stockpile Pre-wet Pre-treat
Potential Cost Savings Hypothetical Example:Material Cost/ton Amt. Total cost neededDry salt $70 10 tons $700Wet salt $90 6.6 tons $594
1 year after Training:Saved Rock salt: 617 tons (68%)$55,000 thefirst year MgCl2: 80 tons (65%) Mississippi River Reduced: Road salt 41% Mag chloride 51% Photo taken by Bobak Ha’Eri http://creativecommons.org/licenses/by-sa/2.5/ Sand 99%
Actual Results• As for the state budget…The salt savings at the U of MN alone in one year ($55,000) more than paid for one year of training across the state.
Twin Cities Metro Area Chloride Management Plan •Minnesota is developing a Twin Cities metro area chloride management plan. Emphasizing working partnerships between industry and environment •Will result in better understanding of our lakes and rivers •Based on water quality information salt reduction targets will be given based on geographic areas (2014). They will be formulated to protect good water and to restore polluted water •Tools are being developed to help organizations assess their operations and move towards lower impact practices •No practices will be mandated. Maintenance operations will have flexibility in making changes appropriate to their organizations to achieve salt reduction targets.For more information contact: Brooke Asleson MPCA Project Manager: email@example.com www.pca.state.mn.us/oxpg9f1
Housekeeping Section:Chart your current and near future practices Internal internal calculationNow Near Practices Code Future 1 Move from 1 to 2 = Bulk salt pile uncovered 1% reduction 2 Bulk salt pile tarped Move from 1 to 3 = 5% reduction 3 Move from 2 to Bulk salt pile indoors 3 = 5% reduction standard best practice Remedial practice Advanced best practice
What type of training is available in your area? Can you provide useful tools to help maintenance professionals make better decisions?